With the original add-on pack to Allied Assault being one of the most successful ever, it was perhaps inevitable that another would be along soon after. It's arrived in the form of Breakthrough, which adds plenty to one of the PC's favourite first-person shooters. The pack moves the action to North Africa and Italy, across 11 new single-player and nine multi-player levels. As before, these environments are realised well, and make differing demands on the player. Plenty of additional weaponry certainly helps in that department. The single-player missions are a bit of a mixed bag, with some standout campaigns set beside a few that are a little more run-of-the-mill. Yet they'll still be happily lapped up by anyone who's worked their way through what's gone before, and the good news is that Breakthrough will last you a good bit longer than the previous expansion pack. Don't expect anything that breaks the mould, though. On the multi-player side, the best addition is the new liberation mode. The idea is that you must rescue players as part of the ongoing battle, and it's really good fun to play. Breakthrough is a good and welcome expansion to a game that's still an office favourite. It's got a few niggles, but it genuinely expands upon the original game and delivers a healthy dose of added entertainment for Allied Assault's many fans. --Simon Brew